package cn.dnf.oneway;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.common.message.MessageExt;

import java.nio.charset.StandardCharsets;
import java.util.List;

public class Consumer {
    public static void main(String[] args) throws Exception{
        //1.获取消费者对象
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("oneway_consumer_group");

        //2.设置nameserver地址
        consumer.setNamesrvAddr("localhost:9876");
        //3.订阅主题
        consumer.subscribe("oneway","hello");

        //4.注册消息监听
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                for (MessageExt messageExt : list){
                    System.out.println(new String(messageExt.getBody(), StandardCharsets.UTF_8));
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });


        //5.启动
        consumer.start();
    }
}
